约翰·肯尼迪

John F. Kennedy

饰：Himself

Edwin Hubble

饰：Himself

John Trauger

饰：Himself - NASA Jet Propulsion Laboratory

Alavaro de Rujula

饰：Himself - CERN

Duccio Macchetto

饰：(as Dr Duccio Macchetto)

Everett Gibson

饰：Himself - NASA Johnson Space Centre

达拉斯·坎贝尔

Dallas Campbell

Chris Burrows

Chris Burrows

饰：(archive footage) (as Dr Chris Burrows)

Jeff Hester

Jeff Hester

饰：(archive footage) (as Dr Jeff Hester)

加来道雄

Michio Kaku

饰：(archive footage) (as Prof Michio Kaku)

Kenneth Nealson

Kenneth Nealson

饰：(archive footage) (as Dr Kenneth Nealson)

布莱恩·考克斯

Brian Edward Cox

饰：(archive footage)

阿尔伯特·爱因斯坦

Albert Einstein

饰：(archive footage)

帕特里克·摩尔

Patrick Moore

饰：(archive footage)